diff options
Diffstat (limited to 'drivers/staging/usbvideo/vicam.c')
-rw-r--r-- | drivers/staging/usbvideo/vicam.c | 952 |
1 files changed, 952 insertions, 0 deletions
diff --git a/drivers/staging/usbvideo/vicam.c b/drivers/staging/usbvideo/vicam.c new file mode 100644 index 0000000..dc17cce --- /dev/null +++ b/drivers/staging/usbvideo/vicam.c @@ -0,0 +1,952 @@ +/* + * USB ViCam WebCam driver + * Copyright (c) 2002 Joe Burks (jburks@wavicle.org), + * Christopher L Cheney (ccheney@cheney.cx), + * Pavel Machek (pavel@ucw.cz), + * John Tyner (jtyner@cs.ucr.edu), + * Monroe Williams (monroe@pobox.com) + * + * Supports 3COM HomeConnect PC Digital WebCam + * Supports Compro PS39U WebCam + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * This source code is based heavily on the CPiA webcam driver which was + * written by Peter Pregler, Scott J. Bertin and Johannes Erdfelt + * + * Portions of this code were also copied from usbvideo.c + * + * Special thanks to the whole team at Sourceforge for help making + * this driver become a reality. Notably: + * Andy Armstrong who reverse engineered the color encoding and + * Pavel Machek and Chris Cheney who worked on reverse engineering the + * camera controls and wrote the first generation driver. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/videodev.h> +#include <linux/usb.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/firmware.h> +#include <linux/ihex.h> +#include "usbvideo.h" + +// #define VICAM_DEBUG + +#ifdef VICAM_DEBUG +#define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args) +#define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args) +#else +#define DBG(fmn,args...) do {} while(0) +#endif + +#define DRIVER_AUTHOR "Joe Burks, jburks@wavicle.org" +#define DRIVER_DESC "ViCam WebCam Driver" + +/* Define these values to match your device */ +#define USB_VICAM_VENDOR_ID 0x04c1 +#define USB_VICAM_PRODUCT_ID 0x009d +#define USB_COMPRO_VENDOR_ID 0x0602 +#define USB_COMPRO_PRODUCT_ID 0x1001 + +#define VICAM_BYTES_PER_PIXEL 3 +#define VICAM_MAX_READ_SIZE (512*242+128) +#define VICAM_MAX_FRAME_SIZE (VICAM_BYTES_PER_PIXEL*320*240) +#define VICAM_FRAMES 2 + +#define VICAM_HEADER_SIZE 64 + +/* rvmalloc / rvfree copied from usbvideo.c + * + * Not sure why these are not yet non-statics which I can reference through + * usbvideo.h the same as it is in 2.4.20. I bet this will get fixed sometime + * in the future. + * +*/ +static void *rvmalloc(unsigned long size) +{ + void *mem; + unsigned long adr; + + size = PAGE_ALIGN(size); + mem = vmalloc_32(size); + if (!mem) + return NULL; + + memset(mem, 0, size); /* Clear the ram out, no junk to the user */ + adr = (unsigned long) mem; + while (size > 0) { + SetPageReserved(vmalloc_to_page((void *)adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + + return mem; +} + +static void rvfree(void *mem, unsigned long size) +{ + unsigned long adr; + + if (!mem) + return; + + adr = (unsigned long) mem; + while ((long) size > 0) { + ClearPageReserved(vmalloc_to_page((void *)adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + vfree(mem); +} + +struct vicam_camera { + u16 shutter_speed; // capture shutter speed + u16 gain; // capture gain + + u8 *raw_image; // raw data captured from the camera + u8 *framebuf; // processed data in RGB24 format + u8 *cntrlbuf; // area used to send control msgs + + struct video_device vdev; // v4l video device + struct usb_device *udev; // usb device + + /* guard against simultaneous accesses to the camera */ + struct mutex cam_lock; + + int is_initialized; + u8 open_count; + u8 bulkEndpoint; + int needsDummyRead; +}; + +static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id); +static void vicam_disconnect(struct usb_interface *intf); +static void read_frame(struct vicam_camera *cam, int framenum); +static void vicam_decode_color(const u8 *, u8 *); + +static int __send_control_msg(struct vicam_camera *cam, + u8 request, + u16 value, + u16 index, + unsigned char *cp, + u16 size) +{ + int status; + + /* cp must be memory that has been allocated by kmalloc */ + + status = usb_control_msg(cam->udev, + usb_sndctrlpipe(cam->udev, 0), + request, + USB_DIR_OUT | USB_TYPE_VENDOR | + USB_RECIP_DEVICE, value, index, + cp, size, 1000); + + status = min(status, 0); + + if (status < 0) { + printk(KERN_INFO "Failed sending control message, error %d.\n", + status); + } + + return status; +} + +static int send_control_msg(struct vicam_camera *cam, + u8 request, + u16 value, + u16 index, + unsigned char *cp, + u16 size) +{ + int status = -ENODEV; + mutex_lock(&cam->cam_lock); + if (cam->udev) { + status = __send_control_msg(cam, request, value, + index, cp, size); + } + mutex_unlock(&cam->cam_lock); + return status; +} +static int +initialize_camera(struct vicam_camera *cam) +{ + int err; + const struct ihex_binrec *rec; + const struct firmware *uninitialized_var(fw); + + err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev); + if (err) { + printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n", + err); + return err; + } + + for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) { + memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len)); + + err = send_control_msg(cam, 0xff, 0, 0, + cam->cntrlbuf, be16_to_cpu(rec->len)); + if (err) + break; + } + + release_firmware(fw); + + return err; +} + +static int +set_camera_power(struct vicam_camera *cam, int state) +{ + int status; + + if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0) + return status; + + if (state) { + send_control_msg(cam, 0x55, 1, 0, NULL, 0); + } + + return 0; +} + +static long +vicam_ioctl(struct file *file, unsigned int ioctlnr, unsigned long arg) +{ + void __user *user_arg = (void __user *)arg; + struct vicam_camera *cam = file->private_data; + long retval = 0; + + if (!cam) + return -ENODEV; + + switch (ioctlnr) { + /* query capabilities */ + case VIDIOCGCAP: + { + struct video_capability b; + + DBG("VIDIOCGCAP\n"); + memset(&b, 0, sizeof(b)); + strcpy(b.name, "ViCam-based Camera"); + b.type = VID_TYPE_CAPTURE; + b.channels = 1; + b.audios = 0; + b.maxwidth = 320; /* VIDEOSIZE_CIF */ + b.maxheight = 240; + b.minwidth = 320; /* VIDEOSIZE_48_48 */ + b.minheight = 240; + + if (copy_to_user(user_arg, &b, sizeof(b))) + retval = -EFAULT; + + break; + } + /* get/set video source - we are a camera and nothing else */ + case VIDIOCGCHAN: + { + struct video_channel v; + + DBG("VIDIOCGCHAN\n"); + if (copy_from_user(&v, user_arg, sizeof(v))) { + retval = -EFAULT; + break; + } + if (v.channel != 0) { + retval = -EINVAL; + break; + } + + v.channel = 0; + strcpy(v.name, "Camera"); + v.tuners = 0; + v.flags = 0; + v.type = VIDEO_TYPE_CAMERA; + v.norm = 0; + + if (copy_to_user(user_arg, &v, sizeof(v))) + retval = -EFAULT; + break; + } + + case VIDIOCSCHAN: + { + int v; + + if (copy_from_user(&v, user_arg, sizeof(v))) + retval = -EFAULT; + DBG("VIDIOCSCHAN %d\n", v); + + if (retval == 0 && v != 0) + retval = -EINVAL; + + break; + } + + /* image properties */ + case VIDIOCGPICT: + { + struct video_picture vp; + DBG("VIDIOCGPICT\n"); + memset(&vp, 0, sizeof (struct video_picture)); + vp.brightness = cam->gain << 8; + vp.depth = 24; + vp.palette = VIDEO_PALETTE_RGB24; + if (copy_to_user(user_arg, &vp, sizeof (struct video_picture))) + retval = -EFAULT; + break; + } + + case VIDIOCSPICT: + { + struct video_picture vp; + + if (copy_from_user(&vp, user_arg, sizeof(vp))) { + retval = -EFAULT; + break; + } + + DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth, + vp.palette); + + cam->gain = vp.brightness >> 8; + + if (vp.depth != 24 + || vp.palette != VIDEO_PALETTE_RGB24) + retval = -EINVAL; + + break; + } + + /* get/set capture window */ + case VIDIOCGWIN: + { + struct video_window vw; + vw.x = 0; + vw.y = 0; + vw.width = 320; + vw.height = 240; + vw.chromakey = 0; + vw.flags = 0; + vw.clips = NULL; + vw.clipcount = 0; + + DBG("VIDIOCGWIN\n"); + + if (copy_to_user(user_arg, (void *)&vw, sizeof(vw))) + retval = -EFAULT; + + // I'm not sure what the deal with a capture window is, it is very poorly described + // in the doc. So I won't support it now. + break; + } + + case VIDIOCSWIN: + { + + struct video_window vw; + + if (copy_from_user(&vw, user_arg, sizeof(vw))) { + retval = -EFAULT; + break; + } + + DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height); + + if ( vw.width != 320 || vw.height != 240 ) + retval = -EFAULT; + + break; + } + + /* mmap interface */ + case VIDIOCGMBUF: + { + struct video_mbuf vm; + int i; + + DBG("VIDIOCGMBUF\n"); + memset(&vm, 0, sizeof (vm)); + vm.size = + VICAM_MAX_FRAME_SIZE * VICAM_FRAMES; + vm.frames = VICAM_FRAMES; + for (i = 0; i < VICAM_FRAMES; i++) + vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i; + + if (copy_to_user(user_arg, (void *)&vm, sizeof(vm))) + retval = -EFAULT; + + break; + } + + case VIDIOCMCAPTURE: + { + struct video_mmap vm; + // int video_size; + + if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) { + retval = -EFAULT; + break; + } + + DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format); + + if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 ) + retval = -EINVAL; + + // in theory right here we'd start the image capturing + // (fill in a bulk urb and submit it asynchronously) + // + // Instead we're going to do a total hack job for now and + // retrieve the frame in VIDIOCSYNC + + break; + } + + case VIDIOCSYNC: + { + int frame; + + if (copy_from_user((void *)&frame, user_arg, sizeof(int))) { + retval = -EFAULT; + break; + } + DBG("VIDIOCSYNC: %d\n", frame); + + read_frame(cam, frame); + vicam_decode_color(cam->raw_image, + cam->framebuf + + frame * VICAM_MAX_FRAME_SIZE ); + + break; + } + + /* pointless to implement overlay with this camera */ + case VIDIOCCAPTURE: + case VIDIOCGFBUF: + case VIDIOCSFBUF: + case VIDIOCKEY: + retval = -EINVAL; + break; + + /* tuner interface - we have none */ + case VIDIOCGTUNER: + case VIDIOCSTUNER: + case VIDIOCGFREQ: + case VIDIOCSFREQ: + retval = -EINVAL; + break; + + /* audio interface - we have none */ + case VIDIOCGAUDIO: + case VIDIOCSAUDIO: + retval = -EINVAL; + break; + default: + retval = -ENOIOCTLCMD; + break; + } + + return retval; +} + +static int +vicam_open(struct file *file) +{ + struct vicam_camera *cam = video_drvdata(file); + + DBG("open\n"); + + if (!cam) { + printk(KERN_ERR + "vicam video_device improperly initialized"); + return -EINVAL; + } + + /* cam_lock/open_count protects us from simultaneous opens + * ... for now. we probably shouldn't rely on this fact forever. + */ + + mutex_lock(&cam->cam_lock); + if (cam->open_count > 0) { + printk(KERN_INFO + "vicam_open called on already opened camera"); + mutex_unlock(&cam->cam_lock); + return -EBUSY; + } + + cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL); + if (!cam->raw_image) { + mutex_unlock(&cam->cam_lock); + return -ENOMEM; + } + + cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES); + if (!cam->framebuf) { + kfree(cam->raw_image); + mutex_unlock(&cam->cam_lock); + return -ENOMEM; + } + + cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!cam->cntrlbuf) { + kfree(cam->raw_image); + rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES); + mutex_unlock(&cam->cam_lock); + return -ENOMEM; + } + + cam->needsDummyRead = 1; + cam->open_count++; + + file->private_data = cam; + mutex_unlock(&cam->cam_lock); + + + // First upload firmware, then turn the camera on + + if (!cam->is_initialized) { + initialize_camera(cam); + + cam->is_initialized = 1; + } + + set_camera_power(cam, 1); + + return 0; +} + +static int +vicam_close(struct file *file) +{ + struct vicam_camera *cam = file->private_data; + int open_count; + struct usb_device *udev; + + DBG("close\n"); + + /* it's not the end of the world if + * we fail to turn the camera off. + */ + + set_camera_power(cam, 0); + + kfree(cam->raw_image); + rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES); + kfree(cam->cntrlbuf); + + mutex_lock(&cam->cam_lock); + + cam->open_count--; + open_count = cam->open_count; + udev = cam->udev; + + mutex_unlock(&cam->cam_lock); + + if (!open_count && !udev) { + kfree(cam); + } + + return 0; +} + +static void vicam_decode_color(const u8 *data, u8 *rgb) +{ + /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB + * Copyright (C) 2002 Monroe Williams (monroe@pobox.com) + */ + + int i, prevY, nextY; + + prevY = 512; + nextY = 512; + + data += VICAM_HEADER_SIZE; + + for( i = 0; i < 240; i++, data += 512 ) { + const int y = ( i * 242 ) / 240; + + int j, prevX, nextX; + int Y, Cr, Cb; + + if ( y == 242 - 1 ) { + nextY = -512; + } + + prevX = 1; + nextX = 1; + + for ( j = 0; j < 320; j++, rgb += 3 ) { + const int x = ( j * 512 ) / 320; + const u8 * const src = &data[x]; + + if ( x == 512 - 1 ) { + nextX = -1; + } + + Cr = ( src[prevX] - src[0] ) + + ( src[nextX] - src[0] ); + Cr /= 2; + + Cb = ( src[prevY] - src[prevX + prevY] ) + + ( src[prevY] - src[nextX + prevY] ) + + ( src[nextY] - src[prevX + nextY] ) + + ( src[nextY] - src[nextX + nextY] ); + Cb /= 4; + + Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 ); + + if ( i & 1 ) { + int Ct = Cr; + Cr = Cb; + Cb = Ct; + } + + if ( ( x ^ i ) & 1 ) { + Cr = -Cr; + Cb = -Cb; + } + + rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) + + 500 ) / 900, 0, 255 ); + rgb[1] = clamp( ( ( Y - ( 392 * Cb ) - + ( 813 * Cr ) ) + + 500 ) / 1000, 0, 255 ); + rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) + + 500 ) / 1300, 0, 255 ); + + prevX = -1; + } + + prevY = -512; + } +} + +static void +read_frame(struct vicam_camera *cam, int framenum) +{ + unsigned char *request = cam->cntrlbuf; + int realShutter; + int n; + int actual_length; + + if (cam->needsDummyRead) { + cam->needsDummyRead = 0; + read_frame(cam, framenum); + } + + memset(request, 0, 16); + request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain + + request[1] = 0; // 512x242 capture + + request[2] = 0x90; // the function of these two bytes + request[3] = 0x07; // is not yet understood + + if (cam->shutter_speed > 60) { + // Short exposure + realShutter = + ((-15631900 / cam->shutter_speed) + 260533) / 1000; + request[4] = realShutter & 0xFF; + request[5] = (realShutter >> 8) & 0xFF; + request[6] = 0x03; + request[7] = 0x01; + } else { + // Long exposure + realShutter = 15600 / cam->shutter_speed - 1; + request[4] = 0; + request[5] = 0; + request[6] = realShutter & 0xFF; + request[7] = realShutter >> 8; + } + + // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0 + request[8] = 0; + // bytes 9-15 do not seem to affect exposure or image quality + + mutex_lock(&cam->cam_lock); + + if (!cam->udev) { + goto done; + } + + n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16); + + if (n < 0) { + printk(KERN_ERR + " Problem sending frame capture control message"); + goto done; + } + + n = usb_bulk_msg(cam->udev, + usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint), + cam->raw_image, + 512 * 242 + 128, &actual_length, 10000); + + if (n < 0) { + printk(KERN_ERR "Problem during bulk read of frame data: %d\n", + n); + } + + done: + mutex_unlock(&cam->cam_lock); +} + +static ssize_t +vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos ) +{ + struct vicam_camera *cam = file->private_data; + + DBG("read %d bytes.\n", (int) count); + + if (*ppos >= VICAM_MAX_FRAME_SIZE) { + *ppos = 0; + return 0; + } + + if (*ppos == 0) { + read_frame(cam, 0); + vicam_decode_color(cam->raw_image, + cam->framebuf + + 0 * VICAM_MAX_FRAME_SIZE); + } + + count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos); + + if (copy_to_user(buf, &cam->framebuf[*ppos], count)) { + count = -EFAULT; + } else { + *ppos += count; + } + + if (count == VICAM_MAX_FRAME_SIZE) { + *ppos = 0; + } + + return count; +} + + +static int +vicam_mmap(struct file *file, struct vm_area_struct *vma) +{ + // TODO: allocate the raw frame buffer if necessary + unsigned long page, pos; + unsigned long start = vma->vm_start; + unsigned long size = vma->vm_end-vma->vm_start; + struct vicam_camera *cam = file->private_data; + + if (!cam) + return -ENODEV; + + DBG("vicam_mmap: %ld\n", size); + + /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes + * to the size the application requested for mmap and it was screwing apps up. + if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE) + return -EINVAL; + */ + + pos = (unsigned long)cam->framebuf; + while (size > 0) { + page = vmalloc_to_pfn((void *)pos); + if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) + return -EAGAIN; + + start += PAGE_SIZE; + pos += PAGE_SIZE; + if (size > PAGE_SIZE) + size -= PAGE_SIZE; + else + size = 0; + } + + return 0; +} + +static const struct v4l2_file_operations vicam_fops = { + .owner = THIS_MODULE, + .open = vicam_open, + .release = vicam_close, + .read = vicam_read, + .mmap = vicam_mmap, + .ioctl = vicam_ioctl, +}; + +static struct video_device vicam_template = { + .name = "ViCam-based USB Camera", + .fops = &vicam_fops, + .release = video_device_release_empty, +}; + +/* table of devices that work with this driver */ +static struct usb_device_id vicam_table[] = { + {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)}, + {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)}, + {} /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(usb, vicam_table); + +static struct usb_driver vicam_driver = { + .name = "vicam", + .probe = vicam_probe, + .disconnect = vicam_disconnect, + .id_table = vicam_table +}; + +/** + * vicam_probe + * @intf: the interface + * @id: the device id + * + * Called by the usb core when a new device is connected that it thinks + * this driver might be interested in. + */ +static int +vicam_probe( struct usb_interface *intf, const struct usb_device_id *id) +{ + struct usb_device *dev = interface_to_usbdev(intf); + int bulkEndpoint = 0; + const struct usb_host_interface *interface; + const struct usb_endpoint_descriptor *endpoint; + struct vicam_camera *cam; + + printk(KERN_INFO "ViCam based webcam connected\n"); + + interface = intf->cur_altsetting; + + DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n", + interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints)); + endpoint = &interface->endpoint[0].desc; + + if (usb_endpoint_is_bulk_in(endpoint)) { + /* we found a bulk in endpoint */ + bulkEndpoint = endpoint->bEndpointAddress; + } else { + printk(KERN_ERR + "No bulk in endpoint was found ?! (this is bad)\n"); + } + + if ((cam = + kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) { + printk(KERN_WARNING + "could not allocate kernel memory for vicam_camera struct\n"); + return -ENOMEM; + } + + + cam->shutter_speed = 15; + + mutex_init(&cam->cam_lock); + + memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template)); + video_set_drvdata(&cam->vdev, cam); + + cam->udev = dev; + cam->bulkEndpoint = bulkEndpoint; + + if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) { + kfree(cam); + printk(KERN_WARNING "video_register_device failed\n"); + return -EIO; + } + + printk(KERN_INFO "ViCam webcam driver now controlling device %s\n", + video_device_node_name(&cam->vdev)); + + usb_set_intfdata (intf, cam); + + return 0; +} + +static void +vicam_disconnect(struct usb_interface *intf) +{ + int open_count; + struct vicam_camera *cam = usb_get_intfdata (intf); + usb_set_intfdata (intf, NULL); + + /* we must unregister the device before taking its + * cam_lock. This is because the video open call + * holds the same lock as video unregister. if we + * unregister inside of the cam_lock and open also + * uses the cam_lock, we get deadlock. + */ + + video_unregister_device(&cam->vdev); + + /* stop the camera from being used */ + + mutex_lock(&cam->cam_lock); + + /* mark the camera as gone */ + + cam->udev = NULL; + + /* the only thing left to do is synchronize with + * our close/release function on who should release + * the camera memory. if there are any users using the + * camera, it's their job. if there are no users, + * it's ours. + */ + + open_count = cam->open_count; + + mutex_unlock(&cam->cam_lock); + + if (!open_count) { + kfree(cam); + } + + printk(KERN_DEBUG "ViCam-based WebCam disconnected\n"); +} + +/* + */ +static int __init +usb_vicam_init(void) +{ + int retval; + DBG(KERN_INFO "ViCam-based WebCam driver startup\n"); + retval = usb_register(&vicam_driver); + if (retval) + printk(KERN_WARNING "usb_register failed!\n"); + return retval; +} + +static void __exit +usb_vicam_exit(void) +{ + DBG(KERN_INFO + "ViCam-based WebCam driver shutdown\n"); + + usb_deregister(&vicam_driver); +} + +module_init(usb_vicam_init); +module_exit(usb_vicam_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); +MODULE_FIRMWARE("vicam/firmware.fw"); |